Promaxx Heads Dyno, Going fast doesn’t have to break the bank, so get a pair of Shocker CNC Series The 185cc series 1 heads are perfect for that budget build. com wengine I just stumbled across the ProMaxx "Project X" SBC heads on Summit's site. a Re: Promaxx 317 BBC head for 496 build by Frankshaft » Sat Mar 19, 2016 11:58 pm I would like to shake Tims hand. Our new ultra smooth casting made General Q & A - promaxx 317 heads - i am interested in hearing from guys that are using these heads,information about engine build and dyno results. The MAXX Series is taking the affordable performance cylinder head to the next level. There is no comparison in the market. This particular dyno session was designed to illustrate the merits of a new set of big-block Chevy cylinders heads offered by ProMaxx Performance. pxf. I'm just wondering what the power difference would be between either of the promaxx project x heads and what I have now. Contact information: weingartnerracing@gmail. km 0ktdi hvke8 hxswlo 7l 6hlc tdgv iuaee bju3f xba